The final component of this protocol is a Phase II randomized clinical trial of the 200 MTBI subjects to evaluate atorvastatin (Lipitor®) as a neuroprotective agent for the treatment of MTBI. The primary endpoint for this trial is three months. This trial will examine the effects of atorvastatin, given orally in a dose of 1mg/kg (up to 80 mg) for seven days, on the development of post-concussive symptoms (PCS), PTSD symptoms, cognitive recovery, and functional outcome at 3 months post-injury, on recovery of EEG and MEG at 3 months post-injury, and on changes in DTI imaging, as well as any effects on liver function.